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arXiv 2104.10337math.NT
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具有非平凡挠率的有理椭圆曲线的局部数据

Local data of rational elliptic curves with non-trivial torsion

Alexander J. Barrios, Manami Roy

摘要:

根据Mazur挠率定理,有理椭圆曲线的非平凡挠子群$T$有14种可能性.对于每个$T$,使得$E$在素数$p$处可以有加性约化,我们考虑一个参数化的椭圆曲线族$E_T$,其性质是它们参数化所有在其扭子群中包含$T$的椭圆曲线$E/\mathbb{Q}$。使用这些参数化的家庭,我们明确地分类Kodaira-Néron型,导体指数,和当地玉川数在每个素数$p$,其中$E/\mathbb{Q}$有加性约化。因此,我们找到了所有有理椭圆曲线的$2$ -扭转或$3$ -扭点,具有整体玉川数$1$。

英文摘要:

By Mazur's Torsion Theorem, there are fourteen possibilities for the non-trivial torsion subgroup $T$ of a rational elliptic curve. For each $T$, such that $E$ may have additive reduction at a prime $p$, we consider a parameterized family $E_T$ of elliptic curves with the property that they parameterize all elliptic curves $E/\mathbb{Q}$ which contain $T$ in their torsion subgroup. Using these parameterized families, we explicitly classify the Kodaira-Néron type, the conductor exponent, and the local Tamagawa number at each prime $p$ where $E/\mathbb{Q}$ has additive reduction. As a consequence, we find all rational elliptic curves with a $2$-torsion or a $3$-torsion point that have global Tamagawa number $1$.

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